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  1. PersianEng

    Force & Moment : Discharge Head with Dresser Coupling

    Bending moment on discharge pipe may happen due to axial forces in the header transferred to the discharge at a Tee fitting or if there are bends in discharge pipe itself. At shutdown if there are measures to prohibit transient and pulsating high pressures from happening, the is no problem...
  2. PersianEng

    carbon steel vs stainless steel pipe

    You could also get a quote for PVC coated carbon steel pipe. Probably it will be cheap enough and make the client happy that you think of cutting all possible expenses.
  3. PersianEng

    Force & Moment : Discharge Head with Dresser Coupling

    If you are going to use a dresser coupling for that application make sure to use "harnessed type". Harness is a number of tie rods that bridges over the coupling and takes the thrust loads so that you don't have to be worry for the coupling to come apart. dresser couplings could tolerate some...
  4. PersianEng

    source for geometry data of human and sheep bones

    Once I had to model human skull and I acquired very accurate geometrical info from MRI files. Although MRI files needs to be changed in format and adjusted to your desired level of accuracy (distance between sections) in some software, one of which is "MIMICS" by MATERIALISE company. Probably...
  5. PersianEng

    Sluice gate design head

    For those of you who were following this thread, here is finally what we did: We replaced the gate with a butterfly valve since sluice gates are not suitable for high differential head applications. Although one of our senior engineers said that he recalls very old installations of sluice gates...
  6. PersianEng

    Sluice gate design head

    I don't agree stainer. Unless the bypass is comparable in size to the gate, what does the bypass valve can do if the pump is continuously discharging upstream of the gate?
  7. PersianEng

    Sluice gate design head

    An sluice gate is operating on a pipe with maximum pressures due to an upstream pump of 50 psi and discharges to an open top tank of 10ft depth. On the other hand since the gate is to contol the flow to the tank and the tank level it may not be fully open sometimes and will see flow presure...
  8. PersianEng

    Actuator:Sluice gate

    Ashereng, I see what you are saying; that's true.Thanks. aticooper, Air is clean but the air cylinder to handle huge thrust load has to be very big.
  9. PersianEng

    Actuator:Sluice gate

    Valid point. However we do not know the actual operating speed and only know that it does not have to be fast; since the gate is operating rarely upon plant shut down or startup. Hydraulic actuators are not allowed in most water treatment application because of the possibility of contamination...
  10. PersianEng

    Actuator:Sluice gate

    Hi there, We are specifying 84" x 144" sluice gates in one of our projects and we expect very high torque and thrust required for the actuator to pull up the gate under a head of 40ft water. What type/brand of electric actuators do you suggest? Thanks
  11. PersianEng

    Large valve rubber lining considerations?

    Thanks everyone for your valuable answers. Actually besides this forum I started a research on the issue and what I got is as follows: Actually joining a cast iron valve to a stainless steel pipe does not make a serious senario of galvanic corrosion but in order to make some cheap preventing...
  12. PersianEng

    Large valve rubber lining considerations?

    Thanks hydrae. These valves are not buried though. So based on what you say I should stress on bonding the lining instead of simply clamping it. I guess pretty rough surface of cast iron is a suitable base for making a strong rubber bond. 1)Do you have any information on the bonding method...
  13. PersianEng

    Mechanical press design

    For this width and as a manual machine you can simply design a scissor like machine with blade pivoted to the scissor bed and cutting against the bed edge.Here is how itlookslike: http://www.staples.com/images/products/catalog/products/S0000595.JPG If you insist to have a vertically moving...
  14. PersianEng

    Large valve rubber lining considerations?

    Thanks Jim. Actually, Pipes were decided to be SS316L due to agressive nature of water fed into the treatment plant. On the other hand cast CF3M (316L)valves were estimated two to three times more expensive than cast iron valves. Therefore we ended up using cast iron valves on SS316L pipe. I...
  15. PersianEng

    Large valve rubber lining considerations?

    I am going to specify Cast Iron butterfly valves (4"-84") on a SS316L piping. In order to avoid galvanic corrosion I have specified all valves to be rubber lined on interior surfaces and flange faces with Neoprene to a thickness of 1/8". 1)Are there any potential problems in rubber lining a...

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